Title:
Aluminum Sleeve for Magnetic Development Roller
Kind Code:
A1


Abstract:
An aluminum sleeve for magnetic development rollers includes an aluminum sleeve and a shaft fixed at the ends of the aluminum sleeve for engaging with a gear, wherein an etching absorption layer is arranged on the surface of the aluminum sleeve, and a nickel plating protect layer is arranged onto the etching absorption layer. A manufacture method thereof involves forming an etching absorption layer on the surface of the aluminum sleeve via a chemical texture etching process, then forming a nickel plating protect layer onto the etching absorption layer via a nickel chemical plating process. The etching absorption layer has fine and uniform particles, and the nickel protect layer prevents the etching absorption layer from being oxidized and improves the wear resistance of the aluminum sleeve.



Inventors:
Ho, Kam Hung (Hong Kong, CN)
Application Number:
12/083179
Publication Date:
02/19/2009
Filing Date:
02/14/2006
Primary Class:
Other Classes:
29/895.32
International Classes:
B05C11/00; B21K1/02
View Patent Images:
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Primary Examiner:
OMGBA, ESSAMA
Attorney, Agent or Firm:
DAVID AND RAYMOND PATENT FIRM (MONTEREY PARK, CA, US)
Claims:
What is claimed is:

1. An aluminum sleeve structure for a magnetic roller, comprising: an aluminum sleeve; a shaft coupling with one end of said aluminum sleeve for gear engagement; an etching absorption layer provided on an outer surface of said aluminum sleeve; and a nickel protective layer overlapped on said etching absorption layer for protecting said etching absorption.

2. A method of manufacturing an aluminum sleeve for a magnetic roller, comprising the steps of: (a) directly chemical-etch an etching absorption layer on an outer surface of an aluminum sleeve; and (b) overlappedly coating a nickel protective layer onto said etching absorption layer, wherein the thickness of said nickel protective layer is less than 10 μm.

Description:

BACKGROUND OF THE PRESENT INVENTION

1. Field of Invention

The present invention relates to accessories of laser printers, copiers, and fax machines, and more particularly to an aluminum sleeve for magnetic development rollers and its method.

2. Description of Related Arts

The magnetic roller inside the drum is considered as one of the important accessories for a laser printer, copier, and/or a fax machine. The magnetic roller generally comprises an aluminum sleeve having an adsorption layer, a magnetic core received in the aluminum sleeve, a conductive terminal coupled at the end of the aluminum sleeve, and two plastic made insulation covers mounted at two ends of the aluminum sleeve respectively. When the magnetic core generates a magnetic field, the toner (carbon powder) is attached to the absorption layer of the aluminum sleeve. Once the magnetic roller is electrified, the aluminum sleeve transforms the array of the toner to the photoreceptor surface of the imaging drum. Therefore, the printing performance of the machine is directly affected by the quality of the absorption layer of the aluminum sleeve. Accordingly, the magnetic roller is generally constructed by the aluminum sleeve having the absorption layer at its outer surface, and a shaft extended at one end of the aluminum sleeve for gear engagement. The absorption layer is formed at the aluminum sleeve by conductive coating or sandblasting methods. However, the two methods have the drawbacks that the absorption layer may attach coarse particles and the particles are unevenly attached on the absorption layer. In addition, the manufacturing process is relatively complicated and the manufacturing cost is relatively expensive. The China patent, from our company 200420051571.X entitled “advance aluminum sleeve for magnetic rollers”, teaches the aluminum sleeve has the etching absorption layer for overcoming the drawbacks of coarse and uneven particles by the conductive coating or sandblasting methods. However, in actual use, the etching absorption layer of the aluminum sleeve is more easily oxidized and its wearing resistance is poor. The oxidation of the etching absorption layer will affect the performance of the magnetic roller while the poor wearing resistance of the etching absorption layer will reduce the service life span of the aluminum sleeve.

SUMMARY OF THE PRESENT INVENTION

A main object of the present invention is to provide an aluminum sleeve for a magnetic roller and its manufacturing method, wherein the aluminum sleeve has an etching absorption layer is adapted for not only preventing the oxidation of the outer surface of the aluminum but also enhancing the wearing resistance of the aluminum sleeve to provide fine and uniform particles on the aluminum sleeve, so as to extend the service life span of the aluminum sleeve.

Accordingly, the present invention provides an aluminum sleeve structure for a magnetic roller, comprises an aluminum sleeve, a shaft securely coupled at one end of the aluminum sleeve for gear engagement, and an etching absorption layer provided on an outer surface of the aluminum sleeve. The aluminum sleeve structure further comprises a nickel protective layer applied (preferably by plating) on the etching absorption layer for protection.

The present invention further provides a method of manufacturing an aluminum sleeve for a magnetic roller, comprising the following steps.

(1) Directly chemical-etch an etching absorption layer on the outer surface of the aluminum sleeve by the chemical texture etching process.

(2) Overlappedly coat a nickel protective layer onto the etching absorption layer by the nickel chemical plating process, wherein the thickness of the nickel protective layer is less than 10 μm.

The aluminum sleeve structure of the present invention provides fine and uniform particles at the aluminum sleeve to enhance the performance of the magnetic roller by overlapping the nickel protective layer on the etching absorption layer. Therefore, the nickel protective layer forms a separation to prevent the etching absorption layer from being contacted with ambient air, so as to prevent the etching absorption layer from being oxidized. In addition, the nickel protective layer has a predetermined hardness to enhance the wear resistance of the etching absorption layer on the aluminum sleeve.

Furthermore, the nickel protective layer is adapted to protectively retain the fine and particles of the etching absorption layer so as to extend the life span of the aluminum sleeve for the magnetic roller.

These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an aluminum sleeve structure for a magnetic roller according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 of the drawing, an aluminum sleeve structure for a magnetic roller is illustrated, wherein the aluminum sleeve structure provides a fine and uniform particle attachment and a high wearing resistance for the magnetic roller. The aluminum sleeve structure comprises an aluminum sleeve 1 and a shaft 2 securely coupled with an end of the aluminum sleeve 1 for gear engagement. An etching absorption layer 3 is provided on an outer surface of the aluminum sleeve 1. The aluminum sleeve structure further comprises a nickel protective layer 4 overlappedly provided onto the etching absorption layer 3.

The method of manufacturing the aluminum sleeve structure of the present invention comprises the following steps.

(1) Directly chemical-etch the etching absorption layer 3 on the outer surface of the aluminum sleeve 1.

Accordingly, in the step (1), the etching absorption layer 3 is applied on the outer surface of the aluminum sleeve 1 by an etching process which comprises the steps of:

(1a) performing a cleaning process: cleaning the aluminum sleeve 1 by chemically degreasing, washing by water, and clean-processing thereof;

(1b) performing an acid pretreatment process: disposing the cleaned aluminum sleeve 1 into an acidic pretreated solution which comprises 1.3 mole/L of hydrogen ions, 2.4 mole/L of chloride ions from a mixture of hydrochloric acid and ammonium chloride, 0.3 mole/L iron ions and zinc ions, wherein the working temperature of the acidic pretreated solution is set at 50° C. and the treatment time thereof is set for 2 minutes, wherein after the acid pretreatment of the aluminum sleeve 1, a plurality of micro etching pits and a plurality of pointers are provided on the outer surface of the aluminum sleeve 1 in a crowded manner to form a positive charged terminal;

(1c) performing an alkaline roughing treatment process: after the aluminum sleeve 1 is treated by the acid pretreatment process, the aluminum sleeve 1 is washed by water and is then disposed in an alkaline roughing solution for re-etching treatment, wherein the alkaline roughing solution comprises 0.6 mole/L of sodium hydroxide solution, 0.3 mole/L of anhydrous sodium carbonate, and 0.35 mole/L of perchlorate ions and nitrate ions, wherein the working temperature of the alkaline roughing solution is set at 65° C. and the treatment time thereof is set for 2 minutes; and

(1d) after the aluminum sleeve 1 is treated by the alkaline roughness treatment process, disposing the aluminum sleeve 1 in a 1:1 nitrate solution for wash-out surface preparation, wherein the aluminum sleeve 1 is then cleaned and dried to form the etching absorption layer 3 on the outer surface of the aluminum sleeve 1.

(2) Overlappedly apply the nickel protective layer 4 onto the etching absorption layer 3. The nickel protective layer 4 is formed on the etching absorption layer 3 by the process comprising the steps of:

(2a) chemically degreasing the aluminum sleeve 1 by using medical sodium hydroxide, anhydrous sodium carbonate, OP-09, sodium silicate, wherein the working temperature is set at 30-40° C. and the treatment time thereof is set for 2 minutes, then the aluminum sleeve 1 is washed by water;

(2b) pickling: using medical nitric acid to treat the aluminum sleeve 1, wherein the working temperature is set at room temperature and the treatment time is set between 20 and 40 seconds, and washing the aluminum sleeve 1 by purified water;

(2c) preliminary dip: using medical sodium hydroxide, zinc oxide, ferric chloride, and sodium tartrate to treat the aluminum sleeve 1, wherein the working temperature is set at room temperature and the treatment time is set between 5 and 20 seconds, and washing the aluminum sleeve 1 by purified water;

(2d) chemical nickel coating: using medical nickel sulphate, sodium acetate, sodium citrate, and sodium hypophosphite to treat the aluminum sleeve 1, wherein the working temperature is set at 85-95° C. and the treatment time is set at 25 minutes, and washing the aluminum sleeve 1 by purified water and drying the aluminum sleeve 1; and

(2e) controlling the thickness of the nickel protective layer being less than 10 μm.

One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting.

It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.